用ajax技术实现 无刷新实现用户登录

// JScript文件
functionusersLogon()
{
varuserName=document.getElementById("txtuserName").value;
varpassword=document.getElementById("txtpassword").value;
varcheckCode=document.getElementById("txtCheckCode").value;

varresponse=userControl_logon.CheckCodeIsRight(checkCode).value;

if(userName=="")
{
document.getElementById("txtuserName").focus();
returnfalse;
}
elseif(password=="")
{
document.getElementById("txtpassword").focus();
if(checkCode=="")
{
document.getElementById("txtCheckCode").focus();
else
{
if(response==true)
{
//判断用户是否存在
userControl_logon.userNameAndPasswordIsExist(userName,password,userNameIsRight);
}
else
{
alert("验证码出错");
userControl_logon.checkCodeOperaotr(refreshCheckCode);
document.getElementById("txtpassword").value="";
}
}
}
functionuserNameIsRight(res)
{
if(res.value==true)
{
用户存在,但要看此用户有没有进入管理留言版权限,
userControl_logon.userNameIsRight(userName,CallBack);
}
else
{
alert("用户名或密码错误");
document.getElementById("txtpassword").value="";
OnLoad_checkCode();
}
}
functionCallBack(res)
{
true)
{
hideLogon();
varurl=userControl_logon.returnUrl();
if(url.value==404)
{
showDefault();
}
else
{
document.getElementById("Url").innerHTML='<ahref="'+url.value+'">'+url.value+'</a>'
}
}
else
{
alert("对不起你的权限不够");
document.getElementById("txtpassword").value="";
OnLoad_checkCode();
}
}
隐藏登录框 functionhideLogon()
{
varelement=document.getElementById("hideLogon")
element.style.display="none"

}
显示返回首页 functionshowDefault()
{
varelement=document.getElementById("Returndefault")
element.style.display="block"
}
functionOnLoad_checkCode()
{
userControl_logon.checkCodeOperaotr(refreshCheckCode);
document.getElementById("txtuserName").focus();
returnfalse;
}
/重新得到新的验证吗 functionrefreshCheckCode(res)
{
document.getElementById("txtCheckCode").value="";
document.getElementById("lblNumber").innerHTML=res.value;
}
functionabce()
{
alert(document.getElementById("lblNumber").value)
}

usingSystem;
usingSystem.Data;
usingSystem.Configuration;
usingSystem.Collections;
usingSystem.Web;
usingSystem.Web.Security;
usingSystem.Web.UI;
usingSystem.Web.UI.WebControls;
usingSystem.Web.UI.WebControls.WebParts;
usingSystem.Web.UI.HtmlControls;
usingSystem.Drawing;
usingLHB_SQL_2005;

public partial classuserControl_logon:System.Web.UI.UserControl
{
protectedvoidPage_Load(objectsender,EventArgse)
{
if(!this.IsPostBack)
{
AjaxPro.Utility.RegisterTypeForAjax(typeof(userControl_logon));
}
}

[AjaxPro.AjaxMethod]
publicstaticstringcheckCodeOperaotr()
{
string_checkCode=GeneralMethod.GenerateCheckCode();
System.Web.HttpContext.Current.Session["checkCode"]=_checkCode;
返回验证码
return_checkCode;
}

///<summary>
判断验证是否正确
</summary><paramname="checkCode"></param><returns></returns>
[AjaxPro.AjaxMethod]
boolCheckCodeIsRight(stringcheckCode)
{
string_checkCode=(string)(System.Web.HttpContext.Current.Session["checkCode"]);
if(_checkCode==checkCode)
{
true;
}
else
{
false;
}
}
判断用户名及密码添加是否正确
<paramname="userName">用户名</param><paramname="_password">用户名密码<returns>bool</returns>booluserNameAndPasswordIsExist(stringuserName,string_password)
{
stringpassword=GeneralMethod.ToEncryptPassword(_password);
stringexecuteString="SELECTCOUNT(*)FROMusersWHEREuserName='"+userName.ToString()+"'ANDpassword='"+password+"'";
intcount=int.Parse(GetCommand.ExecuteScalar(executeString));
if(count==1)
{
System.Web.HttpContext.Current.Session["userName"]=userName;
else
{
false;
}
}

判断用户是不是有这进入管理留言版的权限
booluserNameIsRight(stringuserName)
{
stringexecuteString="SELECT[right]FROMroleWHEREusersId=(selectuserNameIdfromuserswhereuserName='"+userName+"')";
if(count>0)
{
else
{
false;
}
}

返回Url值
stringreturnUrl()
{
stringurl="";
try
{
url=System.Web.HttpContext.Current.Session["url"].ToString();
}
catch
{
url="404";
}
returnurl;
}
}

<% @ControlLanguage="C#AutoEventWireuptrueCodeFilelogon.ascx.csInheritsuserControl_logon %>
< script language ="javascript" type ="text/javascript" src ="../JavaScript/logon.js" >
</ script >
="JavaScript/logon.js" link href ="../CSS/table_css.css" rel ="stylesheet" ="text/css" />
="CSS/table_css.css" body onload ="OnLoad_checkCode();" div table border ="0" cellpadding cellspacing ="0" tr td id ="hideLogon" style ="display:block;" td ="background-color:#99ccff" >用户名： >< input ="text" ="txtuserName" ="width:105px" /></ >密码： ="txtpassword" ="password" >验证码： ="txtCheckCode" ="width:60px" />< label ="lblNumber" ></ label ="button" onclick ="usersLogon();" value ="登录" ="btnLogon" table div ="Url" align ="center" ="Returndefault" ="display:none;" asp:HyperLink ID ="HyperLink1" runat ="server" NavigateUrl ="~/Default.aspx" >返回首页 asp:HyperLink body >